Terminal, base station, communication system, and communication method

Abstract

Provided is a terminal communicating with a base station, in which in a case where a physical downlink control channel is monitored in a first physical downlink control channel-physical resource block set, the physical downlink control channel is decoded in such a manner that the physical downlink control channel is rate-matched based on a prescribed reference signal, and in which, in a case where the physical downlink control channel is monitored in a second physical downlink control channel-physical resource block set, the physical downlink control channel is decoded in such a manner that the physical downlink control channel is rate-matched based on a reference signal that is set individually for each terminal.

1 . A terminal communicating with a base station in a cell, the terminal comprising:
 a downlink control channel detection module that monitors a physical downlink control channel in a first physical downlink control channel-physical resource block set and a second physical downlink control channel-physical resource block set,   wherein, in a case where the physical downlink control channel is monitored in the first physical downlink control channel-physical resource block set, the downlink control channel detection module decodes the physical downlink control channel without assuming a transmission of a reference signal, and   wherein, in a case where the physical downlink control channel is monitored in the second physical downlink control channel-physical resource block set, the downlink control channel detection module decodes the physical downlink control channel with assuming that the physical downlink control channel is transmitted on resource elements which are not used for the reference signal, the reference signal being configured by dedicated RRC signaling.   
     
     
         2 . The terminal according to  claim 1 ,
 wherein a search space in the first physical downlink control channel-physical resource block set is a search space in which the physical downlink control channel added with a CRC scrambled by a paging identifier is monitored, and   wherein a search space in the second physical downlink control channel-physical resource block set is a search space in which the physical downlink control channel added with the CRC scrambled by the paging identifier is not monitored.   
     
     
         3 . The terminal according to  claim 1 ,
 wherein the prescribed reference signal is a channel state information-reference signal (CSI-RS).   
     
     
         4 . The terminal according to  claim 1 ,
 wherein the downlink control channel detection module decodes the physical downlink control channel, assuming a transmission of a cell-specific reference signal (CRS).   
     
     
         5 . A base station communicating with a terminal in a cell, the base station comprising:
 a physical control information notification module that sends the terminal a physical downlink control channel arranging the physical downlink control channel in a first physical downlink control channel-physical resource block set or a second physical downlink control channel-physical resource block set,   wherein, in a case where the physical downlink control channel is arranged in the first physical downlink control channel-physical resource block set, the physical control information notification module arranges the physical downlink control channel without assuming a transmission of a reference signal, and   wherein, in a case where the physical downlink control channel is arranged in the second physical downlink control channel-physical resource block set, the physical control information notification module arranges the physical downlink control channel with assuming that the physical downlink control channel is transmitted on resource elements which are not used for the reference signal, the reference signal being configured by dedicated RRC signaling.   
     
     
         6 . The base station according to  claim 5 ,
 wherein a search space in the first physical downlink control channel-physical resource block set is a search space in which the physical downlink control channel added with a CRC scrambled by a paging identifier is monitored, and   wherein a search space in the second physical downlink control channel-physical resource block set is a search space in which the physical downlink control channel added with the CRC scrambled by the paging identifier is not monitored.   
     
     
         7 . The base station according to  claim 5 ,
 wherein the prescribed reference signal is a channel state information reference signal (CSI-RS).   
     
     
         8 . The base station according to  claim 5 ,
 wherein the downlink control channel detection module decodes the physical downlink control channel, assuming a transmission of a cell-specific reference signal (CRS).   
     
     
         9 . (canceled) 
     
     
         10 . A communication method for use in a terminal communicating with a base station in a cell, the communication method comprising:
 a step of monitoring a physical downlink control channel in a first physical downlink control channel-physical resource block set and a second physical downlink control channel-physical resource block set,   wherein, in the step of monitoring, in a case where the physical downlink control channel is monitored in the first physical downlink control channel-physical resource block set, the physical downlink control channel is decoded without assuming a transmission of a reference signal, and   wherein, in the step of monitoring, in a case where the physical downlink control channel is monitored in the second physical downlink control channel-physical resource block set, the physical downlink control channel is decoded with assuming that the physical downlink control channel is transmitted on resource elements which are not used for the reference signal, the reference signal being configured by dedicated RRC signaling.   
     
     
         11 . A communication method for use in a base station communicating with a terminal in a cell, the communication method comprising:
 a step of sending the terminal a physical downlink control channel by arranging the physical downlink control channel in a first physical downlink control channel-physical resource block set or a second physical downlink control channel-physical resource block set,   wherein, in the step of arranging, in a case where the physical downlink control channel is arranged in the first physical downlink control channel-physical resource block set, the physical downlink control channel is arranged without assuming a transmission of a reference signal, and   wherein, in the step of arranging, in a case where the physical downlink control channel is arranged in the second physical downlink control channel-physical resource block set, the physical downlink control channel is arranged with assuming that the physical downlink control channel is transmitted on resource elements which are not used for the reference signal, the reference signal being configured by dedicated RRC signaling.